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A study was designed to establish what effect, if any, the

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A study was designed to establish what effect, if any, the [#permalink] New post 11 Mar 2007, 03:51
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A study was designed to establish what effect, if any, the long-term operation of offshore oil rigs had on animal life on the bottom of the sea. The study compared the sea-bottom communities near rigs with those located in control sites several miles from any rig and found no significant differences. The researchers concluded that oil rigs had no adverse effect on sea-bottom animals.
Which one of the following, if true, most seriously weakens the researcher’ conclusion?

(A) Commercially important fish depend on sea-bottom animals for much of their food, so a drop in catches of these fish would be evidence of damage to sea-bottom communities.
(B) The discharge of oil from offshore oil rigs typically occurs at the surface of the water, and currents often carry the oil considerable distances before it settles on the ocean floor.
(C) Contamination of the ocean floor from sewage and industrial effluent does not result in the destruction of all sea-bottom animals but instead reduces species diversity as well as density of animal life.
(D) Only part of any oil discharged into the ocean reaches the ocean floor: some oil evaporates, and some remains in the water as suspended drops.
(E) Where the ocean floor consists of soft sediment, contaminating oil persists much longer than where the ocean floor is rocky.
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 [#permalink] New post 11 Mar 2007, 06:34
Answer should be B, as it clarify that the the research should be carried out in distant place rather than at the bottom of the rigs.

(B) The discharge of oil from offshore oil rigs typically occurs at the surface of the water, and currents often carry the oil considerable distances before it settles on the ocean floor.

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 [#permalink] New post 11 Mar 2007, 06:50
(B)

Effects of oil should be several miles, but the comparison study of animal life was not far enough from the site.
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 [#permalink] New post 12 Mar 2007, 20:59
I had some confusion between A and B. I selected B. Can someone explain A to be again?

Thanks

E - Soft Sediment etc - out of scope
D - The evidence presented does not talk about suspended oil droplets etc. Irrelevant
C - sewage and industrial effluent (Out of Scope)
B - BEST ANSWER.
A - Does not talk about oil rigs and its effects in distant places.

A study was designed to establish what effect, if any, the long-term operation of offshore oil rigs had on animal life on the bottom of the sea. The study compared the sea-bottom communities near rigs with those located in control sites several miles from any rig and found no significant differences. The researchers concluded that oil rigs had no adverse effect on sea-bottom animals.
Which one of the following, if true, most seriously weakens the researcher’ conclusion?

(A) Commercially important fish depend on sea-bottom animals for much of their food, so a drop in catches of these fish would be evidence of damage to sea-bottom communities.
(B) The discharge of oil from offshore oil rigs typically occurs at the surface of the water, and currents often carry the oil considerable distances before it settles on the ocean floor.
(C) Contamination of the ocean floor from sewage and industrial effluent does not result in the destruction of all sea-bottom animals but instead reduces species diversity as well as density of animal life.
(D) Only part of any oil discharged into the ocean reaches the ocean floor: some oil evaporates, and some remains in the water as suspended drops.
(E) Where the ocean floor consists of soft sediment, contaminating oil persists much longer than where the ocean floor is rocky.
Director
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 [#permalink] New post 13 Mar 2007, 22:53
B !
_________________

"Education is what remains when one has forgotten everything he learned in school."

  [#permalink] 13 Mar 2007, 22:53
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